Electric welding-machine.



R. C. PIERCE.

ELECTRIC WELDING MACHINE.

APPLICATION FILED DBO. 81, 1913.

1,102,797, Patented July '7, 1914.

llll

I drawings, in which,

UNITED sTATns n rENT OFFICE.

ROBERT CLARK PIERCE, OF CINOINhl'ATI, OHIO, 'ASSIGNOR- TO THE TOLEDO ELECTRIC WELDER COMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

ELECTRIC WELDING-MACHINE.

Specification of Letters Patent.

Patented July '7, 1914.-

To all whom it may concern:

Be it known that I, ROBERT CLARK PIERCE, a citizen of the United States, and a resi-.

dent of Cincinnati, in the county of Hamilton and State of Ohio, have invented a certain new and useful Electric. Welding Machine; and I do hereby declare the folbeing had to the accompanying drawings,

and to the characters of reference marked thereon, which form a part of this specification. 4

This invention relates particularly to improvements in electric welding machines, and has primarily for its object the provision of a simple. and improved form of insulating means for either or both the upper and lower surfaces of the metallic die carrying horns of such machines, whereby mainly to prevent short-circuiting between a surface of the horn and the work should they have contact, such insulating means being secured to a horn in a simple and efiicient manner without the use of retaining screws or bands.

The inventionis fully described in the following specification, and while, in its broaderaspect, it is capable of embodiment in numerous forms, a preferred embodiment thereof is illustrated in the'accompanying Figural is a top view of an electric welding machine horn with my insulating means mounted thereon and partly broken away.

Fig. 2 is a side elevation thereof. Fig. 3 is an enlarged cross-section on the line w, w in Fig. 2, and Fig. 4 is a cross-section of a .slightly different form of horn with both the top and bottom surfaces thereof insulated.

Referring to Figs. 1, 2 and 3 of the drawings, l designates a horn of an electric welding machine, which" horn is of electrical conductive material, such, for instance, as copper, toenable it to form a part of the lead or current conducting means from the customary transformer (not shown) to the welding die which is carried at the outer end of the horn, as by bein mounted in an o ening 2 therein. The sur ace of the horn w ich is to be insulated, such surface being the top of the horn shown in Figs. 1, 2 and 3, has its side-edges extended slightly beyond the body of the horn to form a laterally-projecting bead or rib longitudinally of such edges, as shown at 3.

Mounted over the top surface of the horn with its side edges lapped around the beads 3 thereof is an insulating strip or sheet 4:, preferably of. fibrous nature, and mounted over such strip to. guard and hold it in place is a strip 5, which is preferably of brass, butmay be of some other suitable material. The guard-strip 5 has its side edges rolled or bent around the portion of the insulating strip 4;, which embraces the beads 3,whereby to firmly hold the insulate ing strip to the horn and to cooperate with the beads 3 to retainthe two strips 4 and 5 in position on the horn. The strips 4 and 5 preferably extend substantially the entire length of the horn, or over any surface thereof with which workis apt to have contact, thus preventing liability of short circuiting due to such contact.

In Fig. 4, (i designates a rectangular form of horn, which has both the top and bottom surfaces thereof insulated by the application of the insulating and guard strips 4 and 5'to such surfaces. For this purpose the side edges of the lower as well as of the upper surface are made of protuberant or head form, as shown at 7, to facilitate an.

embracing of such beads by the respective edge portions of the strips 4 and 5.

It is evidentthat my improved insulating I means maybe easily and quickly applied to or removed from the surface of a horn, and is retained in engagement with the horn against accidental removal therefrom without the use of screws, retaining rings or the like. It is also. evident that with this fdrm of insulating means, the insulating strips need not be extended entirely around the horn but may be provided merely for the surface with which the work is likely to have contact.

I wish it-understood that my inventionis not limited to any specific construction or form of the parts, or to the securing of the .same to any particular surface of a horn as numerous variations of the invention from the figures pf the drawing come Within the scope of thenvention.

Having thusdescribed my invention, what I claim as new, and desire to secure by Letlengthwise of its side edges with laterally protuberant beads, an insulating strip cov-- ering such surface and embracing said beads, and a guard sheet of stiff material 10 covering said insulating material and having its side edges embracing said beads and cooperating therewith to retain it and the insulating strip in position on the horn.

In testimony whereof, I have hereunto signed my name to this specification in the ]5 presence of two subscribing witnesses.

ROBERT CLARK PIERCE. Witnesses:

PEARL DUNKMAN, NEIL MAONEALE. 

